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STA 6166 – Fall 2008 – Exam 1
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Name __________
True or False
•
In conducting a hypothesis test regarding a mean, the larger the Pvalue, the
stronger the evidence against the null hypothesis.
False
•
We generally use histograms to display results corresponding to quantitative (as
opposed to qualitative) variables.
True
•
If breaking strengths of wood boards are normally distributed with a mean of 150,
and standard deviation 20; then 95% of such boards have breaking strengths
between 130 and 170.
False
•
A sample that is conducted by taking a random number between 1 and 100, then
taking that item and every 100
th
item after that on a listing of a population is a
systematic sample.
True
•
The (largesample) sampling distribution for the sample mean is normally
distributed only if the underlying population of measurements is normal.
False
•
All else being equal, as we increase the sample size, we increase the width of a
Confidence Interval for
μ
False
Problems
•
Among male birds of a species, 20% have a particular gene. Among females of
the species, 10% have the gene. The males comprise 40% of all the birds of the
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 Fall '08
 Staff
 Histograms

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